RE: [External] : Prefix for command to save it as a Lisp expression

[Drew Adams <drew.adams@oracle.com>]

> Is there any prefix I can type before entering a command which will add
> that command as a Lisp expression to my kill ring?
> 
> For example, [prefix] C-n would add "(next-line)" to my kill-ring.
> 
> The specific use case I have in mind is [prefix] M-x global-set-key,
> where after I finish running the global-set-key I'd have a Lisp
> expression I can put into my init.el.
> 
> Currently, I can do this after the fact by looking at
> list-command-history and kill things out of that.  But it would be cool
> if I could type some prefix and just automatically have the command be
> added to my kill ring.
> 
> Alternatively, maybe there's a way to yank things directly from
> command-history?  Then I could just do that after the fact, rather than
> using a prefix ahead of time, which might be even nicer.

This doesn't answer your question directly.
Hopefully someone else will.
___

FWIW, I use `C-x ESC ESC' (aka `C-x M-ESC'),
which is bound to command `repeat-command'.
That doesn't save the Lisp for the `M-x'
command you _will_ enter.  It shows you the 
Lisp for the command that you last entered.

It shows you, in the minibuffer - to edit
and optionally enter, the Lisp sexp of the
last command invoked with `M-x'.

 M-x global-set-key RET
 ^L                  ; I hit `C-l'
 forward-sexp RET    ; I enter forward-sexp

 C-x ESC ESC

;; I'm prompted in the minibuffer:

 Redo: (global-set-key "^L" 'forward-sexp)

You can grab that text and do anything you
want with it (`M-w' puts it in the kill-ring).
___

(I've written "^L" here (3 chars), but in
reality it's a string with a single char,
Control-L.)